.login-container{
    height: calc(100% - 50px);
    /* 以下三个是为了垂直水平居中 */
    display: flex;
    justify-content: center;
    align-items: center;
}
 .dialog{
    width: 400px;
    height: 300px;
    background-color: rgba(255, 255, 255, 0.8);
    border-radius: 20px;
}
.dialog h3{
    font-size: 20px;
    text-align: center;
    padding: 40px 0;
}
.dialog .row{
    height: 50px;
    display: flex;
    justify-content: center;
    justify-items: center;
}
.dialog .row span{
    width: 80px;
}
#username, #password{
    height: 30px;
    width: 180px;
    font-size: 18px;
    padding-left: 5px;
}
#login-button{
    width: 260px;
    height: 40px;
    border-radius: 5px;
    background-color: green;
    color: rgb(255, 255, 255);

}
#login-button:active{
    background-color: grey;
}